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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa2ab12bed4fc40f82a38c2ea0cdaa0c3d45a294e49e1d210db81778d205eee' 
  AND token = 'SbScAnG/3qg9XserchCcfBcG0v1AOoU0qz2Kbbdqs2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}